/* ===========================
   Reset & Base Styles
   =========================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --secondary-color: #10B981;
    --danger-color: #EF4444;
    --warning-color: #F59E0B;
    --dark-bg: #1F2937;
    --dark-bg-secondary: #374151;
    --light-bg: #F9FAFB;
    --card-bg: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-light: #9CA3AF;
    --border-color: #E5E7EB;
    --success-color: #10B981;
    --info-color: #3B82F6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ===========================
   Container & Layout
   =========================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

.hidden {
    display: none !important;
}

/* ===========================
   Header
   =========================== */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 2rem;
    color: var(--primary-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.api-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--light-bg);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--text-light);
    animation: pulse 2s ease-in-out infinite;
}

.api-status.online .status-dot {
    background: var(--success-color);
}

.api-status.offline .status-dot {
    background: var(--danger-color);
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

/* ===========================
   Main Content
   =========================== */
.main-content {
    padding: 2rem 0;
}

.section {
    margin-bottom: 2rem;
}

/* ===========================
   Cards
   =========================== */
.card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-xl);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(to right, rgba(79, 70, 229, 0.05), transparent);
}

.card-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.card-header i {
    color: var(--primary-color);
}

.card-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.card-body {
    padding: 1.5rem;
}

.login-card {
    max-width: 450px;
    margin: 2rem auto;
}

/* ===========================
   Forms
   =========================== */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-group label i {
    color: var(--primary-color);
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-control-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    transition: var(--transition);
}

.form-control-sm:focus {
    outline: none;
    border-color: var(--primary-color);
}

select.form-control,
select.form-control-sm {
    cursor: pointer;
    background: white;
}

/* ===========================
   Buttons
   =========================== */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--dark-bg-secondary);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background: var(--dark-bg);
    transform: translateY(-2px);
}

.btn-success {
    background: var(--success-color);
    color: white;
}

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
}

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #DC2626;
    transform: translateY(-2px);
}

.btn-warning {
    background: var(--warning-color);
    color: white;
}

.btn-warning:hover:not(:disabled) {
    background: #D97706;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-icon {
    padding: 0.75rem;
    border-radius: 50%;
    background: var(--light-bg);
    color: var(--text-primary);
}

.btn-icon:hover {
    background: var(--border-color);
}

/* ===========================
   User Info
   =========================== */
.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
}

.user-details {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 500;
    color: var(--text-primary);
}

.user-details i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* ===========================
   Tabs
   =========================== */
.tabs {
    display: flex;
    gap: 0.5rem;
    background: var(--card-bg);
    padding: 0.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    margin-bottom: 1.5rem;
    overflow-x: auto;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem 1.5rem;
    background: transparent;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    white-space: nowrap;
}

.tab-btn:hover {
    background: var(--light-bg);
    color: var(--text-primary);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===========================
   Appliances Grid
   =========================== */
.appliances-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.appliance-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.appliance-card::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    transition: var(--transition);
    opacity: 0;
}

.appliance-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.appliance-card:hover::before {
    opacity: 1;
}

.appliance-card.selected {
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.5);
}

.appliance-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    margin-bottom: 1rem;
}

.appliance-icon {
    font-size: 2.5rem;
    opacity: 0.9;
}

.appliance-status {
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.appliance-info h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.appliance-detail {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    opacity: 0.9;
    margin-bottom: 0.25rem;
}

.appliance-detail i {
    width: 16px;
}

.appliance-properties {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.property-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    font-size: 0.875rem;
}

.property-label {
    opacity: 0.8;
}

.property-value {
    font-weight: 600;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
}

/* ===========================
   Control Panel
   =========================== */
.control-panel-content {
    max-width: 800px;
    margin: 0 auto;
}

.selected-appliance-info {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
}

.selected-appliance-info h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.selected-appliance-info .appliance-detail {
    color: white;
}

.control-actions {
    display: grid;
    gap: 1rem;
}

.control-action-card {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.control-action-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.control-action-card h4 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.control-action-card h4 i {
    color: var(--primary-color);
}

.control-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.control-input-group {
    display: flex;
    gap: 1rem;
    align-items: end;
}

.control-input-group .form-group {
    flex: 1;
    margin-bottom: 0;
}

.temperature-display {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    text-align: center;
    margin: 1rem 0;
}

/* ===========================
   Logs
   =========================== */
.logs-container {
    max-height: 600px;
    overflow-y: auto;
}

.log-item {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

.log-item:hover {
    background: var(--light-bg);
}

.log-item:last-child {
    border-bottom: none;
}

.log-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.log-type {
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.log-type.info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--info-color);
}

.log-type.success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.log-type.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning-color);
}

.log-type.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger-color);
}

.log-time {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.log-message {
    color: var(--text-primary);
    font-size: 0.95rem;
}

.log-details {
    margin-top: 0.5rem;
    padding: 0.75rem;
    background: var(--light-bg);
    border-radius: 6px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* ===========================
   Sessions
   =========================== */
.sessions-container {
    display: grid;
    gap: 1rem;
}

.session-card {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    transition: var(--transition);
}

.session-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.session-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.session-user {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.session-user i {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.session-badge {
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.session-badge.active {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
}

.session-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 0.75rem;
}

.session-detail-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.session-detail-item i {
    color: var(--primary-color);
}

.session-detail-item strong {
    color: var(--text-primary);
}

/* ===========================
   Empty State
   =========================== */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 4rem;
    color: var(--text-light);
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1.1rem;
}

/* ===========================
   Toast Notifications
   =========================== */
.toast-container {
    position: fixed;
    top: 80px;
    right: 20px;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.toast {
    background: var(--card-bg);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 300px;
    max-width: 400px;
    animation: slideIn 0.3s ease-out;
    border-left: 4px solid var(--primary-color);
}

.toast.success {
    border-left-color: var(--success-color);
}

.toast.error {
    border-left-color: var(--danger-color);
}

.toast.warning {
    border-left-color: var(--warning-color);
}

.toast.info {
    border-left-color: var(--info-color);
}

.toast-icon {
    font-size: 1.5rem;
}

.toast.success .toast-icon {
    color: var(--success-color);
}

.toast.error .toast-icon {
    color: var(--danger-color);
}

.toast.warning .toast-icon {
    color: var(--warning-color);
}

.toast.info .toast-icon {
    color: var(--info-color);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.toast-message {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1.25rem;
    transition: var(--transition);
}

.toast-close:hover {
    color: var(--text-primary);
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ===========================
   Loading Overlay
   =========================== */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.loading-spinner {
    text-align: center;
    color: white;
}

.loading-spinner i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.loading-spinner p {
    font-size: 1.1rem;
    font-weight: 500;
}

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }

    .tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }

    .appliances-grid {
        grid-template-columns: 1fr;
    }

    .card-header {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    .card-actions {
        width: 100%;
        flex-direction: column;
    }

    .card-actions .btn {
        width: 100%;
        justify-content: center;
    }

    .user-info {
        flex-direction: column;
        gap: 1rem;
    }

    .control-input-group {
        flex-direction: column;
    }

    .session-details {
        grid-template-columns: 1fr;
    }

    .toast-container {
        left: 20px;
        right: 20px;
    }

    .toast {
        min-width: auto;
    }
}

/* ===========================
   Scrollbar Styling
   =========================== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}